Service dead but pid file exists

1 문제상황

[root@jmnote ~]# service squid status
squid dead but pid file exists

[root@jmnote ~]# service squid stop
Stopping squid:                                            [FAILED]
[root@jmnote ~]# service squid start
Starting squid:                                            [  OK  ]
[root@jmnote ~]# service squid stop
Stopping squid:                                            [FAILED]
[root@jmnote ~]# service squid start
Starting squid:                                            [  OK  ]
[root@jmnote ~]#

[root@jmnote ~]# ps -ef | grep squid | grep -v grep
[root@jmnote ~]#

2 확인 및 조치

[root@jmnote ~]# ll /var/run/squid.pid 
-rw-r--r-- 1 root squid 5 Apr  4 22:56 /var/run/squid.pid

[root@jmnote ~]# rm -f /var/run/squid.pid
[root@jmnote ~]# ll /var/run/squid.pid
ls: /var/run/squid.pid: No such file or directory

[root@jmnote ~]# service squid status
squid dead but subsys locked

[root@jmnote ~]# ll /var/lock/subsys/squid 
-rw-r--r-- 1 root root 0 Apr  4 22:58 /var/lock/subsys/squid

[root@jmnote ~]# rm -f /var/lock/subsys/squid 
[root@jmnote ~]# service squid status
squid is stopped

[root@jmnote ~]# service squid start
Starting squid: .                                          [  OK  ]

[root@jmnote ~]# ps -ef | grep squid | grep -v grep
root      7004     1  0 23:01 ?        00:00:00 squid -f /etc/squid/squid.conf